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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41ee295e9f09166f07158563799b91a15686c77e5278d6e409e5ce22118274e9' 
  AND token = 'AvVtXosLwFDykv9yuKBIS2fwE1WXCH0vzb4jcvz0ZCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}